Update Surface ID Terminology

cc/proto/layer_tree_host.proto

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 syntax = "proto2";
 
 import "display_item.proto";
 import "layer.proto";
 import "layer_selection_bound.proto";
 import "layer_tree_debug_state.proto";
@@ skipping 42 matching lines @@
   optional bool has_transparent_background = 22;
   optional bool in_paint_layer_contents = 23;
   optional int32 id = 24;
   optional bool next_commit_forces_redraw = 25;
   optional int32 overscroll_elasticity_layer_id = 26;
   optional int32 page_scale_layer_id = 27;
   optional int32 inner_viewport_scroll_layer_id = 28;
   optional int32 outer_viewport_scroll_layer_id = 29;
   optional LayerSelection selection = 30;
   optional PropertyTrees property_trees = 31;
-  optional uint32 surface_id_namespace = 32;
+  optional uint32 surface_client_id = 32;

[michaelpg, 2016/07/15 18:32:56]

Annoyingly, I had to blow away my entire out directory to build cc after this
change for Simple Chrome (chrome on CrOS). No idea why. Removing the subsets of
the out dir that seemed relevant to this change didn't help.

Just commenting in case someone else bisects to this issue too.

   optional uint32 next_surface_sequence = 33;
   optional uint32 wheel_event_listener_properties = 34;
   optional bool have_scroll_event_handlers = 35;
   optional uint32 touch_start_or_move_event_listener_properties = 36;
   repeated int32 layers_that_should_push_properties = 37;
   optional uint32 touch_end_or_cancel_event_listener_properties = 38;
   optional SkPictures pictures = 39;
 }